package Test_11_20;

public class Test1 {
    public static void main(String[] args) {
        int m = 100;
        double sum = 0.0;
        for(int i = 1;i<=100;i++)
        {
            sum+=1.0/i*Math.pow(-1,i+1);
        }
        System.out.println(sum);
    }
}
